.Drucker, P. F. (2000). Management challenges for the 21st century. Butterworth-Heinemann.
Citazione stile Chigago Style (17a edizione).Drucker, Peter F. Management Challenges for the 21st Century. Oxford: Butterworth-Heinemann, 2000.
Citatione MLA (9a ed.).Drucker, Peter F. Management Challenges for the 21st Century. Butterworth-Heinemann, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.